VoIP, Firewalls and NATs

["Matthias Krawutschke" <Matthias (at) MK-Consults.com>]

Hey Arturo,

well i had some problems with CheckPoint FW-1 NG and NGX with VoIP.
MyServer has an official IP - Address and was in DMZ - Area; My Rules allow
That this VoIP - Server goes out directly. But Checkpoint changed the UDP - Port and the answer doesn´t find the server. At this time I had change that
and I use a PROXY - Firewall - System from Borderware. It works very fine and I had no problems with VoIP, NAT, etc.

Kind regards

Matthias


-----Ursprüngliche Nachricht-----
Von: Voipsec-bounces (at) voipsa.org [mailto:Voipsec-bounces (at) voipsa.org] Im Auftrag von Arturo Servin
Gesendet: Samstag, 4. Februar 2006 13:16
An: Voipsec (at) voipsa.org
Betreff: [VOIPSEC] VoIP, Firewalls and NATs

 

            I am doing a personal research about VoIP security and the use
of firewalls, IPS and NAT. I remember some issues a couple of years ago
specifically with NAT and H.323. I guess there was the same problem with
SIP. Also I remember a topic in this email list about SIP proxys. Do you
know if there are still issues with Firewalls/NAT/IPS and VoIP, how the
vendors and protocols are dealing with this? Any comments?

 

Thanks in advance,

-as

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